Every nurse ought to be careful to wash her hands very frequently during the day. If her face, too, so much the better.

I don't have to be careful, I've got a gun.

Be careful with too much joy,
it can make you numb in life.

You have to be careful as a libertarian because you can sound very Republican.

Sometimes, to stimulate your imagination you have to be careful you don't have too much information. You can Google something, and it's in your face, pow! You don't have time to dream any more about it.

So we have to be careful because if you don't protect your culture you won't have it for very long.